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THE RULES OF THE CITY OF NEW YORK
Title 1: Department of Buildings
Chapter 1: Material and Equipment Application Procedures [Repealed]
Chapter 2: Boiler Inspections [Repealed]
Chapter 3: Vacant and Unguarded Buildings
Chapter 4: Certificates of Occupancy, Live Loads and Occupancy Loads
Chapter 5: Concrete
Chapter 6: Cranes [Repealed]
Chapter 7: Installation and Maintenance of Vent Damper Devices in Existing Boilers and Furnaces [Repealed]
Chapter 8: Demolition [Repealed]
Chapter 9: Rigging Operations [Repealed]
Chapter 10: Drums for Derrick Load and Boom Hoists
Chapter 11: Elevators, Escalators, Personnel Hoists and Moving Walks
Chapter 12: Emergency Power Systems [Repealed]
Chapter 13: Adjudications [Repealed]
Chapter 14: Fees [Repealed]
Chapter 15: Fire Protection
Chapter 16: Inspection of Existing Structures During Construction Operations
Chapter 17: Testing Laboratories and Testing Services
Chapter 18: Resistance to Progressive Collapse Under Extreme Local Loads
Chapter 19: Master Plumbers and Licensed Fire Suppression Piping Contractors
Chapter 20: Piping Systems
Chapter 21: Plans
Chapter 22: Pressure Tanks
Chapter 23: Noncommercial Greenhouses
Chapter 24: Refuse Chutes and Refuse Rooms
Chapter 25: Climber and Tower Crane Riggers [Repealed]
Chapter 26: Safety of Public and Property During Construction Operations. [Repealed]
Chapter 27: Signs
Chapter 28: Smoke Detecting Devices and Systems and Carbon Monoxide Detecting Devices and Systems [Repealed]
Chapter 29: Sprinkler Systems
§ 29-01 Installation of Automatic Sprinklers in Halls and Rooms in Class "A" Multiple Dwellings Used for Single-Room Occupancy Under the Provisions of Subdivision 7-A of § 4 and § 248 of the Multiple Dwelling Law.
§ 29-02 Installation of Automatic Wet-Pipe Sprinklers in Certain Class A and Class B Multiple Dwellings, Including Hotels, Under the Provisions of § 67, Multiple Dwelling Law.
§ 29-03 Installation of Automatic Wet-Pipe Sprinkler Systems and Alarm Systems in Certain Class B Multiple Dwellings (Lodging Houses).
§ 29-04 Installation of Automatic Wet-Pipe Sprinkler Systems and Alarm Systems in Certain Class B Multiple Dwellings (Lodging Houses).
§ 29-05 Installation of Automatic Wet-Pipe Sprinklers in Fireproof Multiple Dwellings Converted to Business Use. [Repealed]
§ 29-06 Installation of Automatic Sprinklers in the Public Halls of Multiple Dwellings Under the Provisions of § 187 (Converted Dwellings) and § 218, Subdivision 5 (Old-Law Tenements), of the Multiple Dwelling Law, and of the Sprinklers in Cooking Spaces in all Types of Multiple Dwellings Under the Provisions of § 33 of the Multiple Dwelling Law.
§ 29-07 Installation of Wet-Pipe Sprinklers.
§ 29-08 Installation of Sprinklers in Rooms of Class B Non-Fireproof Converted Dwellings and in Rooms Used for Class B Occupancy in Non-Fireproof Class A Converted Dwellings Under the Provisions of § 194 of the Multiple Dwelling Law.
§ 29-09 Installation of Chlorinated Poly Vinyl Chloride (CPVC) Sprinkler Pipe and Fittings.
Chapter 30: Storage of Certain Waste Materials
Chapter 31: Suspension, Revocation Or Limitation of Registration [Repealed]
Chapter 32: Walls [Repealed]
Chapter 33: Exemptions from Civil Penalties [Repealed]
Chapter 34: Electrical Code Rules
Chapter 35: Electrical Inspection
Chapter 36: Electrical Contractors
Chapter 37: Reference Standards [Repealed]
Chapter 38: Ventilation
Chapter 39: Cooling Towers and Evaporative Condensers
Chapter 40: Installation and Maintenance of Gas-Fueled Water and Space Heaters in All Portions of Dwellings Used or Occupied for Living Purposes
Chapter 41: Venting of Gas Water Heaters and Other Gas Appliances In Multiple Dwellings
Chapter 42: Entrance Doors, Locks and Intercommunication Systems
Chapter 43: Installation of Security Items in Multiple Dwellings
Chapter 44: Exemptions from Filing Requirements [Repealed]
Chapter 45: Building Permit Application Procedures
Chapter 46: Authorized Representatives
Chapter 47: Licensed Oil-Burning Equipment Installers
Chapter 48: Construction Superintendents [Repealed]
Chapter 49: Outdoor Signs
Chapter 50: Distributed Energy Resource Standards
Chapter 51: Dormitories
Chapter 52: Notification to the Department of Commencement of Work Pursuant to an Earthwork Permit
Chapter 100: [Administration; Enforcement; Maintenance of Buildings; Licensing; Miscellaneous Provisions]
Chapter 300: Use and Occupancy Classification
Chapter 400: Special Detailed Requirements Based on Use and Occupancy [Repealed]
Chapter 900: Fire Protection Systems
Chapter 1000: Means of Egress
Chapter 1100: Accessibility
Chapter 3000: Elevators and Conveying Systems
Chapter 3300: Safeguards During Construction and Demolition
Chapter 3500: Referenced Standards
Chapter 3600: Appendices
Chapter 4000: Electrical Code
Chapter 5000: New York City Energy Conservation Code
Chapter 6000: Fuel Gas Code
Chapter 7000: Mechanical Code
Chapter 8000: New York City Plumbing Code
Chapter 9000: Zoning
Title 2: Board of Standards and Appeals
Title 3: Fire Department
Title 6: Department of Consumer and Worker Protection
Title 9: Procurement Policy Board Rules
Title 12: Franchise and Concession Review Committee
Title 15: Department of Environmental Protection
Title 16: Department of Sanitation
Title 17: Business Integrity Commission
Title 19: Department of Finance
Title 20: Tax Appeals Tribunal
Title 21: Tax Commission
Title 22: Banking Commission
Title 24: Department of Health and Mental Hygiene
Title 25: Department of Mental Health and Retardation [Repealed]
Title 28: Housing Preservation and Development
Title 29: Loft Board
Title 30: Rent Guidelines Board
Title 31: Mayor's Office of Homelessness and Single Room Occupancy
Title 34: Department of Transportation
Title 35: Taxi and Limousine Commission
Title 38: Police Department
Title 38-A: Civilian Complaint Review Board
Title 39: Department of Correction
Title 40: Board of Correction
Title 41: Department of Juvenile Justice
Title 42: Department of Probation
Title 43: Mayor
Title 44: Comptroller
Title 45: Borough Presidents
Title 46: Law Department
Title 47: Commission on Human Rights
Title 48: Office of Administrative Trials and Hearings (OATH)
Title 49: Department of Records and Information Services
Title 50: Community Assistance Unit
Title 51: City Clerk
Title 52: Campaign Finance Board*
Title 53: Conflicts of Interest Board
Title 55: Department of Citywide Administrative Services
Title 56: Department of Parks and Recreation
Title 57: Art Commission
Title 58: Department of Cultural Affairs
Title 60: Civil Service Commission
Title 61: Office of Collective Bargaining
Title 62: City Planning
Title 63: Landmarks Preservation Commission
Title 66: Department of Small Business Services
Title 67: Department of Information Technology and Telecommunications
Title 68: Human Resources Administration
Title 69: Department of Aging
Title 70: In Rem Foreclosure Release Board
Title 71: Voter Assistance Commission
Title 72: Office of Emergency Management
Title 73: Civic Engagement Commission
Title 74: Community Hiring
Chapter 29: Sprinkler Systems
§ 29-01 Installation of Automatic Sprinklers in Halls and Rooms in Class "A" Multiple Dwellings Used for Single-Room Occupancy Under the Provisions of Subdivision 7-A of § 4 and § 248 of the Multiple Dwelling Law.
   (a)   Before the installation of any sprinkler system in any single-room occupancy building is begun, an application, together with plans and specifications for such installation shall be filed with and approved by the Department of Buildings. Plans shall show accurately, both horizontally and vertically, the arrangement and dimensions of the private halls and rooms and the areas to be sprayed by each sprinkler head. Application and specification forms may be obtained at the borough office of the Department of Buildings. Applications shall be filed in the department office in the borough in which the premises are located. Applications and specifications shall be in triplicate. Preliminary plans may be on paper. Final plans shall be filed in triplicate on paper and microfilmed. When it is proposed to supply a sprinkler system by means of a direct connection to a public water supply main, the specifications shall be accompanied by a letter from the Department of Environmental Protection, establishing the fact that the water-supply conditions and pressures are suitable to meet the requirements of these rules for water supplies for sprinklers.
   (b)   Sprinkler systems shall be of the automatic wet type.
   (c)   Water supply from public water mains will be acceptable when such supply will provide a minimum static pressure at the highest sprinkler head or heads of not less than 15 pounds per square inch. Taps connecting to public water mains must be equal in size to the main pipe line, except that: A two-inch (2") tap connecting to the public water main and immediately increased to two-and-one-half inches (2 1/2") direct connection to the public water main and, A one-and-one-half inch (1 1/2") tap connecting to the public water main and immediately increased to two inches (2") in diameter, with piping of the same diameter extending into the building, shall be considered the same as a two-inch (2") direct connection to the public water main. The sprinkler system of each building shall have a separate and independent source of supply. When a sprinkler system is supplied direct from a public water main, it shall be separately and independently connected to the public water main. However, a house service water supply connection may be taken from the sprinkler water supply connection to the public main, on the house side of the main shut-off valve for the building, provided the diameter of the house service water supply connection does not exceed one-half of the diameter of the sprinkler water supply connection. Only one connection of the domestic water supply to the sprinkler water supply line shall be permitted and no shut-off valve shall be placed on the sprinkler supply line other than the main shut-off valve for the building on the street side of the house service water supply connection.
   (d)   A gravity tank upon the roof will be required when the normal minimum water pressure from the public mains is insufficient, or, in lieu of a gravity tank, a pressure tank may be installed in the basement or cellar in accordance with the requirements hereafter specified in these rules. The bottom of each gravity tank supplying the sprinkler system shall be elevated at least 20 feet above the roof. Each gravity tank shall be filled through a fixed water supply tank of at least one-and-one-half inch (1 1/2") diameter and independent of the sprinkler pipe system, by means of an automatically controlled pump of a discharge capacity of at least 65 gallons per minute against the total head, including friction at the discharge nozzle of the pump. The tank fill line shall be standard weight pipe, galvanized steel, or brass or copper pipe. A gravity tank, if used exclusively to supply the sprinkler system, shall have an effective capacity of not less than 1,500 gallons. Gravity tanks which serve both the house supply and the sprinkler system shall have a capacity of not less than 2,500 gallons. All exposed water supply piping connecting with roof gravity tanks shall be properly protected against frost action by four layers of one inch (1") high-grade hair felt, and each layer of hair felt shall be covered with a layer of heavy tar paper. Each wrapping must be securely fastened with heavy twine, and wrapping joints shall have a lap of not less than two inches (2"), staggered with the laps of adjacent layers. All coverings shall be finally covered with heavy canvas, and painted with two coats of water-proof paint. In lieu of the foregoing, three inch thick fiberglass in a metal shield may be used.
   (e)   Pressure tanks when used shall be capable of supplying actual water volume as required in subdivision (j) of this section of these rules. The required water volume shall be two-thirds of the tank capacity and that air pressure one-third. For the pressure to be maintained, pressure tanks shall be constructed and tested in accordance with the requirements of the ANSI/NFiPA 22 of Reference Standard RS 17-10 of the Administrative (Building) Code. At the end of each pressure tank there shall be a glass water level gauge, and the pressure tank must also be provided with a pressure gauge and manhole for access to the tank. The filing pump for the pressure tank shall have a capacity of 65 gallons per minute with sufficient strength to pump water into the pressure tank against full air pressure. The air compressor for the pressure tank must be capable of delivering ten cubic feet of air per minute for the permanent maintenance of the required maximum air pressure in the tank. The filling pipe from pump to air compressor must be provided with a relief valve set at 15 pounds in excess of the maximum air pressure carried in the tank.
   (f)   All tanks shall be supported in accordance with the provisions of the Administrative (Building) Code. All tanks shall be provided with emergency outlets in conformity with § P107.8(c) of Reference Standard RS-16 of the Administrative (Building) Code.
   (g)   Standard one-half inch (1/2") spray type sprinkler heads. Each private hall and room within an apartment having single-room occupancy shall be sprinklered as hereinafter provided. In private halls within apartments, sprinkler heads shall be placed not more than fourteen feet (14') apart. No sprinkler head in a hallway shall be distant more than seven feet (7') from a wall, partition or end of the hall. No sprinkler protection will be required within any closet with a floor area of not more than 20 square feet provided such closet is within a room and the area of the closet is considered as part of the room area in computing the required number of heads.
   (h)   The term "protected area" shall be construed to mean that single-room occupancy apartment within the building requiring the greatest number of sprinkler heads. In computing the required number of heads within a "protected area," the number of heads within the same apartment may be used on the condition that there is no connection to another apartment or private hall. Whenever there is a direct connection between two adjoining apartments, either or both of which are used for single-room occupancy, the combined connected apartments and private halls shall be considered as the "protected area." In computing the required number of heads in a "protected area" of this type, the number of heads within the rooms in the connected apartments or the number of heads required in the private halls of such connected apartments, whichever is greater, shall be used.
   (i)   The total number of heads in the "protected area" requiring the greatest number of heads shall determine the required size of the main supply, including service mains, main branch, tank, down feed and riser, but in no case shall the size of the main supply be less than two inches.
   (j)   There shall be sufficient actual water volume to supply 25 percent of the heads in the "protected area" requiring the greatest number of heads for a period of 20 minutes at 20 gallons per minute.
   (k)   The number of sprinkler heads on a given size of piping shall not exceed the following:
Size of pipe diameters
Maximum number or sprinkler heads allowed
1 inch
2 heads
1 1/4 inch
3 heads
1 1/2 inch
5 heads
2 inch
10 heads
2 1/2 inch
30 heads
3 inch
60 heads
3 1/2 inch
100 heads
4 inch
Unlimited heads
   (l)   The sprinkler main shall not be less in size than the sprinkler rise the check valve of equal diameter to the main and the riser shall be provided on the sprinkler main. For draining the sprinkler system, a 3/4" plugged valve shall be provided on the sprinkler main just inside the aforesaid check valve. All sprinkler piping and fittings shall be so installed that they can be thoroughly drained. On the sprinkler main, an outside screw and yoke gate valve, readily accessible, must be provided near the front of the front of the building and located so as to control the water supply to all the interior sprinkler systems. The said outside screw and yoke gate valve must be sealed in an open position. If tank water supply is used for sprinklers, an outside screw and yoke gate valve shall be provided on the piping leading from the tank to the sprinkler system under conditions similar to those specified for such valves on sprinkler mains.
   (m)   Sprinkler risers shall not be located close to windows and all sprinkler piping shall be properly supported.
   (n)   Sprinkler systems shall be maintained for sprinkler use only, and connections to such sprinkler systems for any other purposes are prohibited.
   (o)   All piping used in sprinkler systems shall be full weight standard steel threaded pipe, well reamed and screwed up tight into fittings without reducing the waterway. Fittings shall be standard cast iron. All fittings placed inside of tank shall be of brass or other non-corroding material.
   (p)   Sprinkler risers shall be provided at the top for testing purposes, with a connection not less than one inch in diameter, with a valved outlet so located that same will be readily accessible at all times. When not in use, the valve shall be provided with an iron or brass plug screwed in tight.
   (q)   Sprinkler systems when completed shall be subjected to a hydrostatic test at a pressure of not less than 30 pounds in excess of the normal pressure required for such sprinkler systems when in service, and shall remain uncovered in every part until they have successfully passed the test. The Department of Buildings, in the borough in which the test is to be conducted, shall be notified when such test is to take place. Tests shall be conducted by the contractor or the owner of the owner's representative, in the presence of a representative of the Building Department.
   (r)   Sprinkler systems shall be inspected at least once in each month by a competent representative of the owner, to ascertain that all parts of the system are in perfect working order. A detailed record of each inspection shall be kept on the premises for examination by the Fire Department, the Department of Housing Preservation and Development, and the Department of Buildings.
   (s)   There shall be kept available on the premises at all times a sufficient supply of extra sprinkler heads and also a sprinkler wrench for use to replace promptly any fused or damaged sprinkler heads. Any head which has opened or has been damaged shall be replaced immediately with a good sprinkler head. Sprinkler heads shall be of a type and manufacture approved by the Board of Standards and Appeals. The minimum operating temperature of all sprinkler heads shall be in the ordinary degree range. Appropriate higher degree operating temperatures shall be required in cooking spaces.
§ 29-02 Installation of Automatic Wet-Pipe Sprinklers in Certain Class A and Class B Multiple Dwellings, Including Hotels, Under the Provisions of § 67, Multiple Dwelling Law.
Effective February 25, 1949, automatic wet-pipe sprinklers used in certain Class A and Class B multiple dwellings, including hotels, shall be installed in conformity with the provisions of the Administrative Code, Subchapter 17 of Chapter 1 of Title 27, except as modified herein. These rules do not apply to sprinkler installations in converted dwellings, lodging houses or multiple dwellings used for single room occupancy.
   (a)   In lieu of one of the four alternate automatic sources of water supply specified in § 27-961, of the Administrative (Building) Code, a connection may be made to the domestic water supply system on the condition that:
      (1)   It can be established from information obtainable from the Department of Environmental Protection that the pressure at the top of the highest riser will be 15 pounds per square inch (except as provided in 1 RCNY § 29-02(f).
      (2)   If the pressure from this source is insufficient to provide a pressure of 15 pounds at the highest line of sprinklers, but is sufficient to supply a pressure of 15 pounds or more at the highest line of sprinklers, an automatic booster pump is provided, the capacity of which shall be sufficient to supply 25 percent of the standard one-half inch (1/2") heads in the sprinkler area having the maximum number of heads, and in no event shall such supply be less than 250 gallons per minute at a pressure of at least 15 pounds at the highest sprinkler line.
      (3)   A local approved type of water-flow alarm is provided, the gong so located that when it operates it may be heard by the occupants or employees, and the gong also plainly marked "Sprinkler Alarm", in red letters one inch in height on a white background. Exception: In a sprinkler area which does not contain more than 36 heads, no water-flow alarm shall be required.
      (4)   A sprinkler shut-off valve is provided conveniently accessible and its purpose clearly indicated by the words "Automatic Sprinkler Shut-Off Valve" on a sign affixed thereto.
      (5)   The size of the domestic water supply line is at least equal to the size of the main sprinkler connection. Note: The provisions of Paragraph c of § 27-964 shall not apply to sprinklers installed in conformity with the provisions of 1 RCNY § 29-02(a).
   (b)   The capacity of gravity tanks for sprinklers shall be in conformity with the provisions of § 27-965 or such tank may be supplied by an automatic filing pump of at least 65 gallons per minute capacity, which shall be sufficient to supply 25 percent of the sprinkler heads in the largest sprinkler area for 20 minutes. The capacity of such tank shall be not less than 1,000 gallons. The bottom of the gravity tank or sprinkler supply pipe shall be not less than 20 feet above the highest supplied sprinkler line. When such elevation is not practicable, an automatic booster pump may be installed in the main sprinkler supply line in conformity with 1 RCNY § 29-02(a)(2).
   (c)   In lieu of complying with the provisions of § 27-965, a pressure tank located not more than one story below the highest supplied sprinkler line, filled by an automatic pump, and with a supply of water, all as described in 1 RCNY § 29-02(b) may be installed. In addition, a high-and-low air alarm shall be provided.
   (d)   The provisions of § 27-963(a) may be construed to permit the sprinkler connection to the street main to be the same size as main sprinkler riser, but in no instance shall it be less than two inches. A tap may be one pipe size less than the sprinkler main.
   (e)   § 27-935 shall apply only when the number of heads in any sprinkler area as defined in these rules exceeds 36.
   (f)   Standard 1/2-inch sprinkler heads. In lieu of applying the provisions of § 27-956, sprinkler heads shall be so spaced that there shall be one head for approximately 168 square feet of floor area, and shall also be spaced not more than 14 feet on centers. The distance from a wall or partition to the first sprinkler head shall not exceed seven feet, measured at right angles to the wall or partition. In multiple dwellings that are presently equipped with sprinklers, the heads in the public halls may be spaced 14 feet on centers, with the first head not more than seven feet from any wall or partition. A 12 pound static pressure will be accepted at the topmost sprinkler line, provided the sprinkler heads are spaced to cover 100 square feet or less. Sprinkler heads may be installed in covered shafts in lieu of fire-retarding on the condition that:
      (1)   Such shafts are not exposed to freezing temperatures;
      (2)   If ventilating louvres, windows or skylights are present in such shafts, the highest head is located a sufficient distance from such openings to prevent freezing;
      (3)   One head is centered at the top of such shaft at the level of the highest ceiling;
      (4)   In shafts constructed in incombustible materials, excepting windows or doors opening thereon, sprinkler heads are placed at each floor level and are staggered at alternate levels;
      (5)   In shafts constructed of combustible materials, and which exceed 60 square feet in cross-sectioned area, sprinkler heads are placed at each floor level and are staggered at alternate floor levels.
   (g)   The protection afforded by sprinklers to stairs, halls, corridors, and other passageways shall also apply to their soffits and overlaps.
   (h)   These rules shall also apply to a store or other space used for business on any story where there are no sleeping rooms and which is not provided with sprinkler heads, unless such spaces are otherwise arranged in conformity with the provisions of § 61, Multiple Dwelling Law.
   (i)   In lieu of complying with the provisions of § 3.9.1.1 of ANSI/NFiPA 13 of Reference Standard RS 17-2 of the Administrative (Building) Code, a 1 inch valved pipe may be extended from the top of the riser to the outside of the building, or inside the building to a deep sink for testing the system, pump and alarm under water-flow conditions.
   (j)   Check valves, gate valves, and water meters shall be installed as and when directed by the Department of Environmental Protection.
   (k)   The term "sprinkler area" as used in these rules shall mean any floor space within a structure enclosed on all sides by exterior walls, fire walls, fire partitions, fire-retarded partitions, or fire-resistive partitions and doors acceptable to the Department of Housing and Buildings. The term "fire-resistive partition" as used in these rules shall mean a partition which is constructed of incombustible materials or wood studs covered on both sides with lath and plaster, plaster board, or other fire-resistive materials acceptable to the Department. Such partitions shall extend from the floor to the ceiling. All doors in such partitions shall be self closing.
   (l)   The sprinkler control valve shall be inspected at least once weekly by a competent person, who is employed by the owner to see that such valves are sealed open, and who holds a certificate of fitness. A record of each inspection shall be kept for examination by a representative of the Department. The provisions of § 27-957, in relation to alarm devices shall not apply to a sprinkler area which does not contain more than 36 heads in multiple dwellings, in which such weekly inspections are made.
   (m)   Systems installed before July 1, 1928 shall be subject to inspection and if found adequate may be accepted by the Department of Buildings. However, in such cases, a copy of the plans approved by the Fire Department shall be filed with the Department of Buildings.
   (n)   Where there are practical difficulties in the way of carrying out these rules, the Superintendent may permit modifications, provided that the spirit of these rules are observed and safety secured.
§ 29-03 Installation of Automatic Wet-Pipe Sprinkler Systems and Alarm Systems in Certain Class B Multiple Dwellings (Lodging Houses).
   (a)   Notice is hereby given that, pursuant to the provisions of Chapter 713 of the Laws of 1929, and Section 4 of Chapter 553 of the Laws of 1944, effective April 5, 1944, automatic wet pipe sprinkler systems installed in "lodging houses", shall be installed in conformity with the provisions of the Administrative Code of the city of New York.
   (b)   An automatic closed-circuit water-flow and valve-tamper alarm system, having at least one manual fire alarm station shall be provided in connection with the sprinkler system. This alarm system shall be connected to an approved central station which provided supervisory and maintenance service satisfactory to the fire commissioner. In connection therewith, there shall be an approved transmitter so arranged as to actuate all gongs of the interior fire alarm system whenever a water flow through the sprinkler system occurs. Interior fire alarm systems of the closed-circuit type previously installed under the rules then in force and approved by the fire commissioner may be accepted if, after inspection and test the systems are found to be adequate and in proper operating condition. Battery operated interior fire alarm systems of the open-circuit type shall be replaced with an approved closed-circuit system. In connection with these rules, the persons affected are advised to consult Article 5 of Subchapter 17 of Chapter 1 of Title 27 of the Administrative (Building) Code and §§ 15-126, 15-127 and 15-214, of the Administrative (Fire Prevention) Code of the city of New York, concerning interior fire alarm system, watchmen's time detector system and telegraphic communication.
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